BE-014: Increase payload limit on POST /devices/{id}/sync to accept 5000 data points

Track: 1 — MVP
Section: 1.5 Historical Backfill
Status: [ ] Todo
Repo: backend-api
Branch: feature/BE-014-increase-sync-payload-limit

Done When

Send 5000-item array → 200 OK, all inserted. Send 5001 → 413 Payload Too Large with clear error message

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